The geographic data of the land accounts of southern Quebec correspond to a set of matrix files with a spatial resolution of 50 meters, qualifying the type of land cover of the Quebec territory located south of the 51st parallel at three distinct times. These geospatial data are those used in the [Southern Quebec Land Accounts, 2023 edition] project (https://statistique.quebec.ca/fr/document/comptes-des-terres-du-quebec-meridional-regions-administratives-et-provinces-naturelles), developed by the Institut de la Statistique du Québec (ISQ). These data are structured around nine land cover classes inspired by the standardization of the System of Economic and Environmental Accounting (SEEA): artificial surfaces, agricultural land, forest wetlands, herbaceous or shrubby wetlands, inland lakes and streams, closed canopy coniferous forests, closed canopy mixed forests, and open canopy forests. The three maps of Quebec land cover are developed for three distinct times: a first corresponding to the 1990s, a second to the 2000s and a third to the 2010s. Comparing these three land cover maps allows us to obtain a new product, namely two maps qualifying land cover changes (transition from one land cover class to another), one during the 1990s and the second during the 2000s. Land Accounts data are compiled using the [Vector Grid System for a Quebec Spatial Data Infrastructure] (https://www.donneesquebec.ca/recherche/fr/dataset/systeme-de-grilles-vectorielles-pour-une-infrastructure-quebecoise-de-donnees-spatiales).**This third party metadata element was translated using an automated translation tool (Amazon Translate).**